Judy O’Connor had no idea a surprise awaited her when she pushed her son, who uses a wheelchair, onto a stage at the commencement at Chapman University on Saturday. As she stepped back to let her son, Marty, have his moment — he was receiving his M.B.A. — a dean kept her on stage. It was then announced that she had been awarded an honorary M.B.A. degree. An emotional Ms. O’Connor blew a kiss, and the crowd was on its feet.